Radial arm support board



FIG. 1 is a first perspective view of a radial arm support board.

FIG. 2 is a second perspective view thereof.

FIG. 3 is a top view thereof.

FIG. 4 is a right side view thereof.

FIG. 5 is a bottom view thereof.

FIG. 6 is a left side view thereof.

FIG. 7 is a front view thereof; and,

FIG. 8 is a back view thereof.

The broken lines illustrate portions of the radial arm support board that form no part of the claimed design. 

CLAIM The ornamental design for a radial arm support board, as shown and described. 